Quote Originally Posted by tkamiya View Post
What I do is to look at both sides of the film using a stereo microscope. Using "through" and "incident" lighting, switching one from the other, one can distinguish the difference between stains IN the image and ON the image.

Wish you good luck and let us know what you find!
Ok, that's clear, I understand what you mean. I will bring the film with me at work tomorrow and get a look. Hope to have some time to do it...

I'll let you know